Big Wall Street investors are now investing roughly 10% of their portfolios into real estate and increasingly, they're putting their money into higher-risk, higher-return properties. Joe Azelby, head of real estate and private markets at UBS Asset Management, said he's concerned about this trend especially among US pension funds. Visit Business Insider's homepage for more stories. Big Wall Street investors are now investing roughly 10% of their portfolios, or $1 trillion, into real estate and increasingly, they're putting their money into higher-risk, higher-return properties. This trend reminds at least one expert of the years before the Great Recession.